private async Task TestSwitchToPoolWorkInner(DynamicThreadPool testInst)
{
Assert.IsFalse(testInst.IsThreadPoolThread);
//Assert.IsNull(SynchronizationContext.Current);
await testInst.SwitchToPool();
Assert.IsTrue(testInst.IsThreadPoolThread);
//Assert.IsNotNull(SynchronizationContext.Current);
}